Safety-lock.



A. PREDERIKSEN.

SAFETY LOOK.

APPLIOATION IILBD NOV. 18,1912.

Patented July 8, 1913.

ANTON FREDERIKSEN, OF COPENHAGEN, DENMARK.

SAFETY-L0 CK.

Specification of Letters Patent.

Application filed November 16, 1912.

Patented July 8, 1913.

Serial No. 731,726.

To all whom it may concern:

Be it known that I, ANTON FRnmnuxsnN, a subject of the King of Denmark, residing at Copenhagen, Denmark, lnwe invented new and useful Improvements in Safety- Loeks, of which the following is a speci fication.

My invention relates to a lock, which is suitable for use both on house-doors and on money safes, and the like, and which cannot be picked, although it is very simple in its construct-ion.

In the accompanying drawings, Figure 1 is a front view of the lock, Fig. 2 a horizontal section through the center of the lock, Fig. 3 is a section along the line A-B in Fig. 2, and Figs. 4 and 5 show the key seen from the side and from its front end, respectively.

The lock-casing consists of two parts 1 and 2, which are screwed together and disposed and fastened in the door in a suitable manner. In part 2 there is disposed a turnable cylinder 3, through which there loosely pass a number, for instance four, of pins 4:. These pins can be turned both around their own respective axes and, together with the cylinder 3, around the latters axis; and the lock is opened by first turning the aforesaid pins a certain distance around their respective axes and then turning the entire set of parts around their common axis, with a view to withdraw the bolt. These turning movements take place in the manner described here below, to wit :At its front end each of the pins 4: has an inward-protruding pin 5, while at their rear end they are bored out; and in the wall of this bored out passage there are slits 6, Fig. 3. In the part 1 of the lock-casing there is stationarily disposed a ring 7, which, with protruding parts 8, stands forth in the bored out passages of the pins and normally prevents them from turning together with the cylinder 3, while they do not prevent the pins from being turned around their own axes. The cylinder 3 is, by means of a bolt 9, or the like, fastened to a plate 10, movably connected with the part 1, and this plate 10 is, by means of bolts 11, or other suitable n1embers, connected with the lock-bolt, which is not shown in the drawings.

The key, Figs. 4 and 5, is provided with grooves 12 along the surface of its shank, which grooves make it possible for it to be inserted between the pins 5 and between the pins 4. These grooves run down the shank in a spiral, so that the key, on being inserted in the lock, gives the pins a certain turning around their own respective axesv Springs 13, which may, however, be arranged in another manner than that shown, normally hold the pins in the shown position and bring them back to this position when they are released after having been turned by the key or some other object.

The length and pitch of the spiral grooves 19. are, in each look, so adapted to the slits 6 in the pins t that the latter, when the key inserted, are turned sullicicntly around their own axes so that the slits ('3 will stand exactly over the ring 7 and in front of its projecting parts 8, and it is then possible, by turning the key, also to turn the whole set of movable parts (3, 4t, 9, 10, 11) around the common, central axis, and in so doing, the bolts 11, or the corresponding members, withdraw thclock-bolt and leave the door unlocked. As soon as the key is drawn out, all the parts return to their original positions, the lock-bolt being actuated by an ordinary return spring.

The grooves 12 may be different in one and the same lock and still be widely different in the different locks.

Since all the pins must simultaneously be turned so that their slits (3 stand over the ring 7, the lock cannot possibly be opened except by means of the proper key.

Having now described my invention,what I claim is:

1. A safety lock comprising :in combination, a suitable casing. a tumbler guide rotatively mounted in said casing, a plurality of tumblers rotativcly mounted in said guide, means normally engaging said tu1nblers to prevent; rotation thereof about their own axes and to prevent rotation of said tumblers and guide about the axis of the latter, and means for simultaneously rotating said tumblers to release engagement thereof with said first named means, substantially as described.

2. A safety lock comprising in combination, a suitable casing, a tumbler guide rosaid tumblers to release said first named tatively mounted in said casing, tumblers romeans, substantially as described. 10 tatively mounted in said guide, means nor- In testimony whereof I aflix my signature mally engaging said tumblers to prevent in presence of two Witnesses.

' rotation thereof about their own aXes and t0 ANTON FREDERIKSEN.

prevent rotation of said tumblers and guide WVitnesses: about the axis of the latter, and spirally HANS PETERSEN, formed means for simultaneously rotating KARL PETERSEN.

Copies 01 this patent may be Obtained for five cents each, by addressing the Commissioner of IB-atents, Washington, D. G. 

